The issue only happens on the Samsung monitor using the HD7970. I was running GTX 460 in SLi for years with no issues. I swapped the old video cards back to test and it works flawlessly. I have replaced my XFX HD 7970 by RMA with a new card and I am still getting the same issues. I replaced my active mini display port adapter as well. I tested the Monitor and all cables and they work fine with other PC's. I really believe it is the HD7970 video card that does not play nice with this old Samsung monitor.

Anyone have any advice? I think I am either going to get rid of the monitor or go back to Nvidia and maybe buy GTX 680's or 690's. This is really frustrating. I contacted XFX support and they are no help either.

I just remembered that I did run the Dell and Samsung only for a week and it was still having the same issues. Surely the card can handle two 24 inch monitors. I tried swapping all the cables and ports but that didn't help.